Update sphinx requirement from <9.0,>=8.0 to >=8.0,<10.0 (#16)

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.0.0
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -23,7 +23,7 @@ classifiers = [
 ]
 dependencies = [
     "syntax-diagrams>=1.0.0,<2.0",
-    "sphinx>=8.0,<9.0",
+    "sphinx>=8.0,<10.0",
     "PyYAML>=6.0,<7.0",
     "antlr4-python3-runtime>=4.13,<4.14",
 ]